Fluke 6062A - Page 63

-
—
—
—
/
\
'•
„
s
—
( IEEE-488
bus >
dba
aa
aaa
's.a 4-
a ..cb ;
a paaaaa-x
1
V
V
\
Figure
2-6.
6062A IEEE-488 Bus
Connected to a 6062A IEEE-488
Bus
If the
listen-only
mode is selected,
the Generator is always
addressed to listen, and
the front
panel ADDR indicator
is always lit. The Generator
listens and responds
to all data messages
on the IEEE-488
Interface. The response
to data messages is the
same as in the addressed
mode
of operation except that
requests for talker output
are ignored.
In the listen-only
mode, the talker,
remote/local,
service request,
device clear, and
device
trigger interface
functions
do not apply.
2-50.
Command
Syntax
The Generator IEEE-488 bus commands alphabet consists
of the letters A through Z (upper
and lower case letters are
treated equally), digits 0 through
9,
and the following special
characters:
@
.
,
;
+ -
CR
LF
Spaces, tabs characters, and
the parity bit are ignored.
The IEEE-488
commands
for the Generator
consist of
the following three
parts:
Header
Numeric
Suffix
The header
is always required,
but the numeric
and suffix may
be optional. This
rule gives the
following four possible
combinations:
(HEADER)
(HEADER) (NUMERIC)
(HEADER)
(NUMERIC)
SUFFIX)
(HEADER) (SUFFIX)
Multiple commands
may be separated
with one of the end of string (EOS)
characters or
Use of EOS characters facilitates
recovery in the event of
a
syntax
error and will also enhance
readability.
2-51.
COMMAND HEADER SYNTAX
The command header is
a two alpha-character string. A list
of the IEEE-488 command headers
used on the Generator
is presented in Table
2-8.
The header determines the
syntax of the
numeric and
suffix as listed in
the table.